Trigonometric Identities
Trigonometric Identities
Trigonometric Identities
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Example 5<br />
Copyright © 2009 Pearson Addison-Wesley 1.1-26<br />
APPLYING THE COSINE DIFFERENCE<br />
IDENTITY TO VOLTAGE (continued)<br />
(c) Determine a value of so that the graph of<br />
is the same as the graph of<br />
Using the negative-angle identity for cosine and a<br />
cofunction identity gives<br />
Therefore, if<br />
5.2-26